Hi. I have a number of classes that use a module as a mixin. Not sure if
I have my terms correct there. Anyway here is one of the classes......
require 'predicate'
class Song
include Pred
@@songs = [ ]
attr_accessor :name, :album, :artist, :time, :year, :id, :in_libs
def initialize(name, album, artist, time, id, in_libs)
@name = name
@album = album
@time = time
@artist = artist
@id = id
@in_libs = in_libs
end
def to_s
puts "<< #{@name} >> by #{@artist} in their album #{@album}.\n"
end
def self.list
@@songs
end
def self.list_add=(val)
@@songs << val
end
end
.....................................
Here is the module....
module Pred
def isa?(target_class)
instance_of?(target_class)
end
end
........................................
Here is another module that I use to fetch data form classes such as
Song........
module Tuneuts
def self.fetch(item, out = [])
all = Song.list + Actor.list + Album.list + Library.list
case
when item.instance_of?(String)
all.each do |obj|
if obj.name.downcase == item.downcase
then out << obj end end
if (out.length > 1)
then MyErr.new("multiple_answer_error", item, "fetch").do_it end
when item.isa?
all.each {|obj|
if obj.eql?(item) then out << obj end}
else MyErr.new("weird_item", item, "fetch").do_it
end
out.first
end
end
............................
The problem is Song.list (in the module Tuneuts) is returning nothing.
Am I missing something here?
I've attached the whole program as a zip file FYI.
Thanks for taking a look
Attachments:
http://www.ruby-forum.com/attachment/5233/problem.zip
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